基于线性调频的雷达通信一体化波形研究进展

A novel photonic method of linearly frequency-modulated (LFM) signal generation with high purity based on the monolithically integrated semiconductor laser (MISL) subject to the dynamical optoelectrical feedback is proposed and demonstrated in this paper. In this approach, the MISL is firstly operated in period-one state. By introducing the dynamical optoelectrical feedback to modulate the MISL, the generated LFM signals would be constantly optimized as long as the delay of the feedback loop is matched with the repetition period of the LFM signal. In this system, no additional high-speed external modulator, high-frequency electrical LFM oscillator are required, highly simplifying the framework and reducing the power consumption. In the current proof-of-concept experiment, one LFM signal with the bandwidth as large as 5.6 GHz is generated and the corresponding frequency comb contrast can be drastically improved by 51 dB. Furthermore, the effect of the delay mismatch is also discussed in this paper.

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高灵敏度光束位置信号提取的激光通信跟瞄一体化（特邀）

Chen Xinyu,

Lu Shaowen,

Zhu Funan

et al. 2024

激光与光电子学进展

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A space optical communication system with intensity modulation direct detection based on four quadrant detector tracking and communication multiplexing has been reported, which uses the dual optical wedge driven by ultrasonic motor as the beam deflection execution unit to form a closedloop system for beam position tracking. The rotation period of the driving motor is 15 ms, and the position resolution is 0. 83 μrad. Through theoretical analysis and experimental verification, the position closedloop tracking − 3 dB bandwidth of this system is about 4 Hz. When the position detection error is less than 10%, that is, the beam detection accuracy is less than 12 μrad, and the corresponding detection sensitivity is − 45. 2 dBm. At a communication rate of 10 Mbit/s and without signal encoding, the corresponding communication sensitivity is − 44 dBm when the bit error rate is 1×10 − 3 . It has been verified that it is feasible to use the fourquadrant detector as a tracking and communication multiplexing detector, which can be applied to small and lightweight interstellar laser communication terminals.

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基于线性调频的雷达通信一体化波形研究进展

Cited by 3 publications

References 72 publications

Photonic generation of frequency agile LFM signals for ISAC systems

Photonic generation of frequency agile LFM signals for ISAC systems

High-purity linearly frequency-modulated signal generation based on the integrated semiconductor laser subject to the dynamical optoelectrical feedback

高灵敏度光束位置信号提取的激光通信跟瞄一体化（特邀）

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